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I feel like the moral of this story is telling us that the world is cruel and never ever trust anyone. Kill them all before they can hurt you. Cho ah is too innocent and mujin has to clean up all his messes so I can't say I hate mujin as a character. He's realistic and pragmatic. If he had not killed that village of doctors they would have most likely gang raped cho ah.
Is it overwork? Drug withdrawal symptoms? What is it?????
someone said that apparently whatever magic thing they gave him back when he was kidnapped and tortured is reacting really badly with his body